Pulverizer.



(No Model.)

Patented Sept. H, i900. J. DAVISON.

PULVERIZEFL (Application filed Oct 24, 1899.

2 Sheets-Sheel No. 657,76l.

Patented Sept. ,1900.

J. DAVISON.

PU LVERIZER.

(App1ica.t ion filed Oct. 24, 1899.)

2 Shady-Sheet 2.

(No Model.)

jnverzzbv- JMWW NrrED STATES PATENT QFFIQCEQ JOSEPH DAVISON, OF NEW YORK, N. Y.

PU LVERIZER.

SPECIFICATION forming part of Letters Patent N0. 657,? 61, dated September 11, 1900.

Application filed October 24, 1899.

To all whom it may concern:

Be it known that I, JOSEPH DAVISON, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, and State of New York, have invented a new and useful Improvement in Pulverizers, of which the following is a specification.

My invention relates to an improvement in pulverizers, with the object in view of providing a machine which is more particularly adapted to grinding and pulverizing stone and ore, which machine shall consist of a large grinding-roll and a plurality of small grinding-rolls having a direct frictional contact therewith, the said small grinding-rolls having their body portions reduced to diameters of different sizes for producing passes between them and the large grinding-roll of different depths.

Afurther object is to provide a new and improved means for permitting the smaller rolls to yield slightly away from the main roll when any matter should become jammed between the smaller roll and the larger roll which it would be impossible to crush, thus saving the machine from being wrecked.

A practical embodiment of my invention is represented in the accompanyingdrawings, in which- Figure 1 represents a front View of the machine with its front plate removed for disclosing the several rolls. Fig. 2 is a side view of the machine, and Fig. 3 is a vertical central section from front to rear through the same in the plane of the line 3 3 of Fig. l.

The framework of the machine is composed as follows: A side base-plate A is located at each side of the machine, which base-plates are adapted to rest upon a suitable flooring or support. Upon each of these side baseplates A, I provide a pair of upper side plates B and O, the said upper side plates being so secured to the base-plate as to permit one of the side plates to have a slight sliding movement toward and away from the other side plate upon the base-plate. In thepresent instance I have shown the side plate 0 as being permitted to yield and the side plate B as being rigidly secured to the base-plate. The

side plate 0 is permitted this sliding move- I of the side plates together.

ment by passing a bolt 0 upwardly through serial No. 734,610. lllo model.)

an opening in the top flange a of the base plate A and through an elongated slot 0 in an outwardly-extended flange at the bottom of the plate 0. The plate B is held rigidly in position by means of a bolt 5, which extends upwardly through a hole in the flange a and through a hole in the outwardly-extended flange b at the base of the plate B, the two flanges being securely fastened to gether by setting up the nut Z).

The pairs of side plates B and C are held snugly together, except under undue strain, in the following manner: At the bases of the side plates B and O, I provide a bolt D, which extends longitudinally through a pair of outwardly-extended lugs b b of the plate B and a similar pair of lugs c c of the plate C, the end of the bolt 1) being screw-threaded and extended a considerable distance beyond the front of the machine. An adjusting-nut d is engaged with said screw-threaded end of the bolt D, and a heavy coil-spring d is interposed between the said nut and the lug c of the plate 0, the tension of the said spring d being exerted in a direction to hold the bases The tension of the spring (1 may be adjusted by means of the nut cl.

To hold the upper ends of the plates B and 0 together, I provide a bolt E, which extends longitudinally through a double lug b at the top of the plate B and a double lug c at the top of the plate 0. The free end of the bolt E is screw-threaded and projects a considerable distance to the front of the machine, and the screw-threaded end is provided with an adjusting-nut e. A heavy coiled spring 6 is interposed between the adjusting-nut e and the double lug c, the tension of the said spring being exerted in a direction tending to hold the tops of the plates B and O together. The tension of the spring 6 maybe adjusted by means of the nut e.

The side base-plates A may be rigidly spaced apart by a plurality of tie-rods a, each of which tie-rods has an adj ustable lock-nut connection a With each of the side base-plates A. The pairs of side plates B and O are rigidly spaced apart by a plurality of tie-rods Z) and cl, each of the tie-rods I) having an ad'- justable lock-nut connection b with each of the side plates B and each of the tie-rods 0 having a similar adjustable lock-nut connection a with each of the side plates 0.

A central drive-shaft F is mounted in pairs of side frames B and O. This shaft F has keyed thereto the large main grinding-roll G in the space between the two pairs of side plates. The shaft is provided upon one side of the machine (in the present instance the left-hand side) with a suitable drive-pulley f, which may be driven in any suitable manner such, for instance, as by a belt f, leading: from a source of power, not shown herein.

A plurality of small roll-shafts (in the present instance four of these shafts are shown) are mounted in the side plate 0 at equal distances from the main roll-shaft F, spaced from the grinding-roll G, which small rollshafts are designated by H I J K. These shafts are provided with small grinding-rolls 72. U It, respectively, which rollers are of the same diameter at their ends and are in direct frictional engagement with the periphery of the large roller G, so that the said small rollers are driven by the rotary movement of the large roller.

Wide shallow circumferential grooves of different depths are formed in the small i grinding-rolls intermediate their ends, the grooves being formed of gradually-lessening depths from the top roll 72 to the bottom roll it, so as to produce a progressive grinding; of the material being treated as it passes l from the top of the machine between the successive small grinding-rolls and the large grinding-roll. i

A pair of pulverizing-rolls Z and m are carried by outside shafts L and M, which shafts I are mounted between the side base-plates A 1 of the machine. These pulverizing-rollers are located in position to receive the ground 1 material as it drops from the bottom grinding-roll 7c and serve to complete the process of pulverizing the material being treated. The shaft L is mounted in stationary bearings, and it is provided upon one side of the machine with a suitable pulley Z, which is. driven at a high rate of speed by means of a belt Z leading to a larger pulley f carried by the main drive-shaft F. The shaft M is mounted in movable bearings, so that the roll 5 m may be moved toward and away from the 5 roll Z, the means which I have shown herein comprising a wedge-block N, interposed between the bearing m in each of the side base- 1 plates A and the base-plate, the said wedgeblock N being controlled by an adjusting screw 'n.

A hopper 0 may be carried by the machine between the pairs of side plates in position to feed the material into the space between the top small roll h and the large grinding-roll G. Guide-partitions Pp may be placed in position to guide the material as it falls from the grin ding-roll to the pulverizing-rolls land m.

The front and back of the machine may be protected by plates Q q, extending from the top of the machine between the pairs of side plates to the side base-plate A.

To insure an extended bearing for the main roll-shaft F, outwardly-extended semicylindrical lugs 19 and a may be provided on the side plates B and O, the said lugs having a suitable liningsleeve f, of some suitable bearing metal. Similarly each of the small grinding-roll shafts may be provided with an extended bearing in the side plates 0 by providing the side plates with outward ly-extended lugs 0 which may be provided with suitable lining-sleeves 0 of some suitable hearing metal.

In the structure hereinabove set forth I provide for a progressive grinding of the material and a final pulverization of the same in a simple and effective manner, the structure I at the same time being very strong and not liable to get out of order. Should a piece of material be fed to the machine which is too hard to be crushed, the side plates C would be forced slightly away from the side plates B, thus preventing the wrecking of the machine.

It is evident that changes might be resorted to in the form and arrangement of the several parts without departing from the spirit and scope of my invention. Hence I do not wish to limit myself strictly to the structure herein set forth; but

What I claim is- In a pulverizer, the combination with a smooth-faced large grinding-roll, of a plurality of smaller grinding-rolls having their ends of uniform diameters, the said ends being normally in direct frictional engagement with and driven by the large grinding-roll, each of the said small grinding-rolls having a shallow circumferential groove therein intermediate its ends, the grooves in the several small grinding-rolls being of gradually-lessening depths from the top small roll to the bottom small roll for producing successive reductions of the material being treated, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 19th day of October, 1899.

JOSEPH DAVISON. Witnesses:

FREDK. HAYNES, O. S. SUNDGREN. 

